Are you restoring this car or just need it to run well? It will matter whether this is a California car or not. The original set up was on a diagram/sticker on the radiator support or fan shroud and the hoses were color striped to help route them.
If you are in trouble with it just running well for now you can plug off almost all of them except the choke pull off (primary) - skip secondary for now if equipped, and the EGR should be connected to a vacuum port that applies vacuum with air speed or venturi effect vacuum not manifold vacuum or it will screw it up. You can just skip the EGR but it may knock at part throttle without it. This EGR should do nothing at idle or WOT position.
I may have some paper diagrams of this and no scanner here to put them on the 'puter.
Just know that most of that stuff was just to reduce emissions and make the engine run better when cold for just a few minutes and then the stuff didn't matter,
T
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Tom Greenleaf - MetroWest, Boston
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NEED A VACUUM HOSE ROUTING SCHEMATIC DIAGRAM FOR A 1977 CHEVROLET IMPALA 
